The Noctua NF-A15 PWM also retails for about $23 and is backed by a 6-year warranty. Below you see the fans' package, which includes all the product features printed at the front and back sides of it.

Opening the box unveils the contents

1x Noctua NH-A15 PWM product

1x Low-Noise Adaptor (L.N.A.)

1x 4-Pin Y-Cable

1x 30cm Extension Cable

4x Vibration-Compensators

4x Fan Screws

The Noctua NF-A15 PWM has a 150mm wide round frame and has been designed for use on today’s high-end CPU coolers. While its 150mm width matches those of most high-end heatsinks, its 140mm height doesn’t make it extend on top, ensuring case compatibility.

The NF-A15’s standard 120mm mounting holes (105mm spacing) also make it an ideal performance upgrade for 120mm case or CPU fans. The NF-A15 supports the automatic PWM speed control, meaning that the fan will control its rotating speed according to the feedback it gets from motherboard's temperature sensors.

The NF-A15 PWM also takes advantage of all those technologies and features found on the NF-A14 series, including the side Flow Acceleration Channels, Noctua’s AAO (Advanced Acoustic Optimization) frames with integrated anti-vibration pads as well as Noctua’s proprietary Stepped Inlet Design and Inner Surface Microstructures, Noctua’s Stepped Inlet Design and SSO2 bearing.

Last but not least, the NF-A15 PWM is also supplied with a Low-Noise Adaptor (L.N.A.) that reduces the maximum fan speed from 1200 to 900rpm. The L.N.A can be used either to run the fan at a fixed speed of 900rpm or to cap the maximum speed when using automatic PWM control.